logd: drop can_read_security_logs

This has become useless after refactoring; we instead ensure that the
LOG_ID_SECURITY bit isn't set in log_mask, instead of having this
additional check.

Test: logging unit tests
Change-Id: Id47b288d056ebf2b5bd26be94006f17c24fafd31

logd/LogBufferTest.h

@@ -45,7 +45,7 @@ void FixupMessages(std::vector<LogMessage>* messages);
 class TestWriter : public LogWriter {
   public:
     TestWriter(std::vector<LogMessage>* msgs, bool* released)
-        : LogWriter(0, true, true), msgs_(msgs), released_(released) {}
+        : LogWriter(0, true), msgs_(msgs), released_(released) {}
     bool Write(const logger_entry& entry, const char* message) override {
         msgs_->emplace_back(LogMessage{entry, std::string(message, entry.len), false});
         return true;

logd/LogReader.cpp

@@ -45,11 +45,8 @@ static std::string SocketClientToName(SocketClient* client) {
 
 class SocketLogWriter : public LogWriter {
   public:
-    SocketLogWriter(LogReader* reader, SocketClient* client, bool privileged,
-                    bool can_read_security_logs)
-        : LogWriter(client->getUid(), privileged, can_read_security_logs),
-          reader_(reader),
-          client_(client) {}
+    SocketLogWriter(LogReader* reader, SocketClient* client, bool privileged)
+        : LogWriter(client->getUid(), privileged), reader_(reader), client_(client) {}
 
     bool Write(const logger_entry& entry, const char* msg) override {
         struct iovec iovec[2];
@@ -162,9 +159,11 @@ bool LogReader::onDataAvailable(SocketClient* cli) {
 
     bool privileged = clientHasLogCredentials(cli);
     bool can_read_security = CanReadSecurityLogs(cli);
+    if (!can_read_security) {
+        logMask &= ~(1 << LOG_ID_SECURITY);
+    }
 
-    std::unique_ptr<LogWriter> socket_log_writer(
-            new SocketLogWriter(this, cli, privileged, can_read_security));
+    std::unique_ptr<LogWriter> socket_log_writer(new SocketLogWriter(this, cli, privileged));
 
     uint64_t sequence = 1;
     // Convert realtime to sequence number

logd/LogWriter.h

@@ -23,8 +23,7 @@
 // An interface for writing logs to a reader.
 class LogWriter {
   public:
-    LogWriter(uid_t uid, bool privileged, bool can_read_security_logs)
-        : uid_(uid), privileged_(privileged), can_read_security_logs_(can_read_security_logs) {}
+    LogWriter(uid_t uid, bool privileged) : uid_(uid), privileged_(privileged) {}
     virtual ~LogWriter() {}
 
     virtual bool Write(const logger_entry& entry, const char* msg) = 0;
@@ -35,12 +34,10 @@ class LogWriter {
     uid_t uid() const { return uid_; }
 
     bool privileged() const { return privileged_; }
-    bool can_read_security_logs() const { return can_read_security_logs_; }
 
   private:
     uid_t uid_;
 
     // If this writer sees logs from all UIDs or only its own UID.  See clientHasLogCredentials().
     bool privileged_;
-    bool can_read_security_logs_;  // If this writer sees security logs.  See CanReadSecurityLogs().
 };

logd/SimpleLogBuffer.cpp

@@ -164,10 +164,6 @@ bool SimpleLogBuffer::FlushTo(
             continue;
         }
 
-        if (!writer->can_read_security_logs() && element.getLogId() == LOG_ID_SECURITY) {
-            continue;
-        }
-
         if (((1 << element.getLogId()) & state.log_mask()) == 0) {
             continue;
         }